Merged branch 'dev_native' into lm_sla_supports_auto

Added igl library files

src/igl/copyleft/opengl2/texture_from_tga.cpp

@@ -0,0 +1,68 @@
+// This file is part of libigl, a simple c++ geometry processing library.
+// 
+// Copyright (C) 2014 Alec Jacobson <alecjacobson@gmail.com>
+// 
+// This Source Code Form is subject to the terms of the Mozilla Public License 
+// v. 2.0. If a copy of the MPL was not distributed with this file, You can 
+// obtain one at http://mozilla.org/MPL/2.0/.
+#include "texture_from_tga.h"
+#include "tga.h"
+#include <cstring>
+
+IGL_INLINE bool igl::opengl::texture_from_tga(const std::string tga_file, GLuint & id)
+{
+  using namespace std;
+
+  // read pixels to tga file
+  FILE * imgFile;
+  // "-" as input file name is code for read from stdin
+  imgFile = fopen(tga_file.c_str(),"r");
+  if(NULL==imgFile)
+  {
+    printf("IOError: %s could not be opened...",tga_file.c_str());
+    return false;
+  }
+
+  // gliReadTGA annoyingly uses char * instead of const char *
+  size_t len = tga_file.length();
+  char* tga_file_char = new char [ len + 1 ];
+  strcpy( tga_file_char, tga_file.c_str() );
+  // read image
+  gliGenericImage* img = gliReadTGA(imgFile, tga_file_char, 0, 0);
+  // clean up filename buffer
+  delete[] tga_file_char;
+  fclose( imgFile );
+
+  // set up texture mapping parameters and generate texture id
+  glGenTextures(1,&id);
+  glBindTexture(GL_TEXTURE_2D, id);
+  // Texture parameters
+  float empty[] = {1.0f,1.0f,1.0f,0.0f};
+  glTexParameterfv(GL_TEXTURE_2D,GL_TEXTURE_BORDER_COLOR,empty);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
+  //glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER,
+  //  GL_LINEAR_MIPMAP_NEAREST);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
+    GL_LINEAR);
+
+  // OpenGL by default tries to read data in multiples of 4, if our data is
+  // only RGB or BGR and the width is not divible by 4 then we need to alert
+  // opengl
+  if((img->width % 4) != 0 && 
+   (img->format == GL_RGB || 
+    img->format == GL_BGR))
+  {
+    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+  }
+
+  // Load texture
+  glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, img->width,
+    img->height, 0, img->format, GL_UNSIGNED_BYTE,
+    img->pixels);
+  return id;
+}
+
+#ifdef IGL_STATIC_LIBRARY
+// Explicit template instantiation
+#endif